An open capillary tube contains a drop of water. The internal diameter of the capillary tube is 1mm. Determine the radii of curvature of the upper and lower meniscuses in each case. Consider the wetting to be complete. Surface tension of water = 0.073 N/m. (g = 9.8 m/s 2 )
(i) When the tube is in its vertical position, the drop forms a column with a length of 2 cm.
Text Solution
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(i) a (ii) b (iii) c
Sol. As the wetting is complete. so upper meniscus radius will be same as radius of capillary in all cases.
r 4 = 
= 0.5 mm.
Now
Fs = T × 2 π rl.
so balancing forces in vertical direction.
= T × 2 π r l + T × 2 π r c .
get r l = 
– r c
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